Camera accessory and cartridge

Abstract

A camera accessory to receive a cartridge of photosensitive material and direct the said photosensitive material into a camera. A light-tight enclosure having a door therein permits the cartridge to be introduced into the interior of the accessory. The cartridge is provided with a hollow core upon which the photosensitive material is wound. A light-tight bag of plastic material overlies the photosensitive material. After the cartridge is placed within the enclosure and the door closed, an elongated plunger operable from without the enclosure and extending through the door urges the bag into the hollow core thereby uncovering the photosensitive materials for subsequent feeding into a camera.

Having thus fully described the invention what is claimed as new and desired to be secured by Letters Patent is: 
     
       1. A camera accessory and cartridge comprising a light-tight enclosure, an access door on said enclosure, an elongated plunger carried by the door and slideable therethrough from the exterior to the interior of said enclosure, a hollow mandrel secured within the enclosure and extending in the direction of the access door and coaxial with the plunger, a cartridge comprising a hollow core, a supply of photosensitive material carried upon the core, a light impervious bag having a closed and an open end overlying the said light impervious material, means to secure the open end of the bag to the core in light-tight contact with said core, said cartridge being slideably received upon said mandrel, and means within the housing to advance the photo-sensitive material through an exit slot in the light-tight enclosure. 
     
     
       2. A camera accessory according to claim 1 in which the light-tight enclosure is (somewhat box-shaped having) provided with front, rear, top, bottom and side walls, the door is secured to the front wall and the mandrel is secured to the rear wall. 
     
     
       3. A camera accessory according to claim 1 in which the plunger is of an outside diameter which will be freely received within the cartridge core and the hollow mandrel. 
     
     
       4. A camera accessory according to claim 1 in which the plunger is provided with a plug slideably carried upon the plunger for limited movement into and out of engagement with the adjacent end of the cartridge. 
     
     
       5. A camera accessory according to claim 4 in which the plug is coupled to the plunger by means of a lost motion slot and a pin carried by the plunger and received in said slot. 
     
     
       6. A camera accessory according to claim 1 in which the plunger has a longitudinal travel of a length which will substantially dispose the bag within the cartridge core. 
     
     
       7. A camera accessory according to claim 1 in which the photosensitive material advancing means comprises a knob secured to the plunger on the exterior end thereof, a pair of rollers to receive the photosensitive material, a control knob operatively coupled to the rollers and guide strips between the cartridge and the said rollers. 
     
     
       8. A camera accessory according to claim 1 in which the mandrel is freely journaled within a bushing secured to the interior of the container.